Stapling machine



March, 1930. y J. B. czRoFOOT 1,749,456,

STAPLING MACHINE Mardi 4, l930 J. B. cRoFooT 1,749,466

STAPLING MACHINE Filed May 4. 1928 2 Sheets-Sheet 2 '5.5.51' I 4 J5 W @if J4 EQ; J7 la A f4 4x5 4i 45C" l' 4 44' I .ff 4f 5 4@ l 4i 1U T ik# 41 210 l ff fz l y, 3 45 43 i; 1? V I E i 4g' we v j' f s .f 2 y 4i /5 J7 ZY/feminin f 47 '//wse. l :J2/27a a/MZ;

Patented Mar. 4, 1930 PATENT orales I JOHN IB. CROFOOT, F ARLINGTON HEIGHTS, ILLINOIS S'IAPLING MACHINE Application led May V4, 1928. Serial No. 274,988.

My invention relates to stapling machines ofV the magazine vtype adapted to receive staplesinstrips for individual attachment to y papers, boxes and the like.

The'object of my invention is to provide a device of the-kind described, convenient of operation, positive in action, and durable of Wear. r Another object is to provide a stapling machine with novel means insuring the ejection and use of the last staple of a strip of staples, thereby obviating jamming and clogging of the machine. Additional objects and advantages of the method in construction herein employed will appear more fully in the herein specification when taken in connection with the accompanying drawings in which: 252 F igurel is a sectional view, partly in elevation, of a staplingfmachine embodying my. invention. y

-Figure 2 is a top plan view thereof.

Figure 3 vis a sectional view taken on line 5 3 3 yot Figure 1. v

Figure 4 is avsectional view, partly in ele vation of a stapling machine similar to that shown infrFigurel, the operating handle being depressed, showing the plunger about to "be released.

Figure 5 is a sectional'view taken online 5-5 of Figure 4. l

Figure 6is'a fragmentary sectional view lof amoditiediorm of my invention.

In the drawingswhereinsimilar characters of reference indicate corresponding parts in. the several views, 11 designates the handle or" my staplingmachine, to which is pivotally secured byv the pin `12, the operating lever u handle 13 which has riveted thereon ahand grip 14 on whicliis attached by pin 15 a tensionspring 16, the other end of the spring 16 being hooked over the pin 16 on the upper part of'thehandlell. f

Forminganintegral part of the handle 11,

is a barrel 17, having a bore 18, whereon re-y ciprocates aplunger 19 to the top of which is secured an annular member 20, having a pair or" pockets 21, 22 accommodating the ends of springs 23, 24, which are secured therein by pins 25, 26 respectively. The other ends of the springs 23, 24 lie within longitudinally extending pockets l27, 28 in the barrel 17, being secured in the pockets by other pinsy 29, 30,-these elements being best shown in Fig- 60 ure 5 wherein the barrel 17 together with bore 18 and plunger 19 are shown surmounted by. a cap 31 which is secured to the handle 11, by screws 31.

i The plunger 19 as shown in Figures 1 and 4 65 y is provided with a cam 32 secured to a pin 33 and rockably mounted'thereon'in an arcuate notch 34. The cam 32 has a recess 35 to accommodate a spring 36 which seats in the pocket 37 kin the plunger body, the spring serving to impel the cam into offset position whereby engagement is had with the heel 38 of the operating lever 13 until the heel on its upward swing passes over the point of the cam, as shown in Figure 4, and then permits the latter and consequently the plunger 19 to be propelled forcibly downward under the tension ofsprings 23 and 24. The plunger in its descent engages and cuts off one of the staples from the strip 39 which latter lies Within a magazine chamber 40, over a guide member 41, being fed forward a staple at a time by the point of feed pawl 42 'which is secured to sliding bolt 43, which has a slot 43 accommodating the pin 44 of the handle 11. 8";

The bolt 43fis impelledby a spring 44', the heel 45 of the bolt being adapted to enter into notch 45 of plunger 19 when the latter rises with the depression of operating lever 13 to a point where the notch engages the heel of the bolt. As best shown in Figures 1 and 4 the feed pawl 42 has a spring 42 secured thereto, this spring lying within a pocket 46 of the bolt 43, being secured to pin 51. n

As best shown in Figure 3, it will be seen u that the point of feed pawl 42 consecutively engages one at a time-'the center row of'holes 47 of the strip of staples 39,-the feeding action being accomplished after the pawl 42 is retracted'when the-plunger 19 descends to l y cut off an individual staple. The forward at a time, and to maintain same in position.

for the next feeding movement of the pawl 42. As will be seen in these gures the hold back pawl is likewise mounted on a pin48 secured to a part of the handle 11, and is impelled into operative engagement with the stapling strip by means of the spring 49.y

rlhe functiony and mode of operation of the embodiment of my invention shown in Fig-KV ures 1 to 5 inclusive has been, in large part indicated by th-e foregoing description, but will now be made ymore fully apparent by the following brief explanation: assuming that a strip of staples has been inserted in the magazine chamber 40, to the position shown in Figures 1 and 4, when the operating'lever 13 is depressed, it will be observed the upward movement of the plunger 19 will permit one of the staples to enter the bore 18 under the influence of feed pawl 42. As indicated above when the heel 38 of the operating lever swings past the point of cam 32, the plunger 19 will be driven downwardly with considerable force by the springs 23, 24. The bottom of the Y plunger 19 engaging the strip protruding into the bore will cut off same in the customary manner and secure the strip to the articles desired, The function of the hold back pawl is merely to hold the strip in position while the point ofthe feed pawl returns to engage another hole. 1

With reference to the embodiment shown in Figure 6, it will be observed that I have provided the feed pawl with an additional arm 50. The function of the additional arm is an important one in thatit provides' a. means in cooperation with the arm of the regular pawl 42 of insuring the feeding of the last of a series of staples. This is accomplished as follows: Byinspection of Figure 6 it will be noticed that the additional arm 50 will thrust forward into position to be cut oil the staple immediately adjacent the bor-e 18. When this staple has been cut o, it will be noted that the normal arm 42 now ceases to function but that the additional arm 50 will again function to feed into theV bore the last staple, which may be driven into the article desired inthe normal manner. In Figure 6, for the purpose of illustration it may be assumed that the two staples next adjacent the bore are the last of the strip ofv staples. Y

While I have described with particularity a preferred construction, it will be understood that the device is susceptible of variation and change without departing from the spirit or sacrificing any 'of the advantagesv of Y the invention as defined in the appended claims.

What I claim as new and desire to secure by Letters Patent is: v

1. A stapling machine comprising a frame having an integral handle, a yieldingly-held operating lever pivoted to said handle, a c

plunger having an arcuate recess, a spring-ac- Vtuatedcam mounted on' a pin secured to said plunger ywithin the recess, said cam being directly engaged by said' lever, means to pro# gressively feed a strip of staples one by one yinto a bore to be individually sheared olf by said plunger, and means including a pair of springs to return said operating lever to normal position after operation thereof, each of said springs being secured in one of a pair of pockets in an integral part of the handle and having a connection to said plunger.

' 2. A stapling machine comprisinga frame having an integral handle and a barrel with a bore, a plunger in saidv bore, a 'plurality of springs contained directly in a pair of 'pock- Y ets integrally formed with said barrel andfsecured to saidplunger, an oset cam mounted vin a recessed part of said plunger, a hand-operated lever pivoted to said handle and having direct engagement with saidcani, means to feed a strip of staples from a magazine forming a part of the frame, and means to return said operating handle to position after manipulation thereof. f

3. A stapling machine comprising a frame Y having an integral barrel having a bore and a magazine'chamber, a plungerslidable in said bore, an annular member secured' to said plunger, a pair ofpockets in said barrel, aV

spring in each of said pockets, said springs being secured to said annular member, a

spring pressed bolt engaging said plunger,

and a Vfeed pawl actuated by said bolt in a Y mannerto thrust a series' of staples inthe y form of a strip, one by one into the path of said plunger, said pawl being adapted to insure the ejection of the last of a series of staples, substantially Vas described. Y

4. A stapling machine comprising a unitaryV frame including a barrel having a bore therein and a groove accommodating a strip of staples, aV plurality of spring accommodating pockets in said barrel one on each side i'ie of said bore, a plunge-r slidable in said bore,

a member Ycarried thereby, springs secured to said member and received in said pockets, mechanism actuated by said plunger for feeding a staple strip so as to dispose the end staple of the stripfin said bore, an operating lever adapted to raise the plunger in a manner to tension said springs, said lever tripping said plunger ata given point in its ascent, and means to return the operating lever to normal posi-tion after said plunger has been tripped. f

5. In a stapling machine comprising a frame, an operating handle, a stap1e-containing magazine, a shearing spring-propelled plunger, a spring-pressed bolt engaging said plunger, and a combination feeding pawl mounted on said bolt, said pawl including two arms, one of said arms serving to normally feed staples on a strip', one at a time, to the action of the plunger, the other of said arms serving to eject the last staple of a strip of staples.

6. In a stapling machine comprising a frame, an operating handle, a staple-containing magazine, a shearing spring-propelled plunger, and a plurality of pawls Within said frame, one of said pawls acting to prevent retractive movement of the staples within the magazine, the other of said pawls having a pair of arms pivoted thereto, one of said arms serving to eject the last of a series of staples on a strip from the magazine, the other of said arms operating to feed the staples one at a time to the action of said plunger.

7. A stapling machine comprising a frame having an integral barrel having a pair of pockets one on each side of a central bore, a

tension spring secured in each of said pockets, a member attached to both of said springs, a plunger carrying said member, a spring pressed cam pivoted on said plunger, an ope-rating handle to engage said cam in order to raise the plunger against the tension of the springs, said cam being released from the operating handle at a certain point in the ascent of the plunger, means operated by the ascent and descent of the plunger to automatically and progressively feed staples one at a time to the shearing of said plunger, and means insuring ejection of the last of a strip of staples, thereby leaving the magazine of the stapling machine free for the introduction of a new strip of staples.

8. A stapling machine comprising a frame having a rmagazine for the receptionof a strip of staples, a casing integral with said frame, said casing having a central bore'and a pair of pockets one on each side of said bore, a pair of springs secured in said pockets, a plunger connected to said springs and tslidable in saidbore, said plunger having a notch, a spring pressed bolt receivable in said notch and having a guide slot receiving a pin secured to the frame, said plunger and said notch cooperating to cause reciprocation of said bolt, a feed pawl pivoted to said bolt, said feed pawl having a pair of arms, one of said arms being for the normal progressive feeding of said strip of staples into the bore, the other of said arms serving as a means to feed and eject the last of said strip offstaples into the bore, a spring actuated retention pawl serving to prevent retraction of the strip of staples, and a cap inclosing the bore, part of said barrel and said plunger. 'f Y V9. A stapling machine comprising a frame having a staple-containing magazine chamber, a spring-propelled plunger having a cam, an operating handle cooperating with said cam and yieldingly maintained in inoperative position by a spring, and a pair of pawls to feed and prevent retraction of a strip of staples within said magazine, one of said pawls having a pair of prongs adapted to engage the outer row of holes of a strip JOHN B. CROFOOT. 

